#[non_exhaustive]
pub enum TrialComponentPrimaryStatus {
Completed,
Failed,
InProgress,
Stopped,
Stopping,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against TrialComponentPrimaryStatus
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let trialcomponentprimarystatus = unimplemented!();
match trialcomponentprimarystatus {
TrialComponentPrimaryStatus::Completed => { /* ... */ },
TrialComponentPrimaryStatus::Failed => { /* ... */ },
TrialComponentPrimaryStatus::InProgress => { /* ... */ },
TrialComponentPrimaryStatus::Stopped => { /* ... */ },
TrialComponentPrimaryStatus::Stopping => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when trialcomponentprimarystatus
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant TrialComponentPrimaryStatus::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
TrialComponentPrimaryStatus::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant TrialComponentPrimaryStatus::NewFeature
is defined.
Specifically, when trialcomponentprimarystatus
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on TrialComponentPrimaryStatus::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Completed
Failed
InProgress
Stopped
Stopping
Unknown(UnknownVariantValue)
Unknown
contains new variants that have been added since this code was generated.
Implementations§
Trait Implementations§
source§impl AsRef<str> for TrialComponentPrimaryStatus
impl AsRef<str> for TrialComponentPrimaryStatus
source§impl Clone for TrialComponentPrimaryStatus
impl Clone for TrialComponentPrimaryStatus
source§fn clone(&self) -> TrialComponentPrimaryStatus
fn clone(&self) -> TrialComponentPrimaryStatus
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for TrialComponentPrimaryStatus
impl Debug for TrialComponentPrimaryStatus
source§impl From<&str> for TrialComponentPrimaryStatus
impl From<&str> for TrialComponentPrimaryStatus
source§impl Hash for TrialComponentPrimaryStatus
impl Hash for TrialComponentPrimaryStatus
source§impl Ord for TrialComponentPrimaryStatus
impl Ord for TrialComponentPrimaryStatus
source§fn cmp(&self, other: &TrialComponentPrimaryStatus) -> Ordering
fn cmp(&self, other: &TrialComponentPrimaryStatus) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq<TrialComponentPrimaryStatus> for TrialComponentPrimaryStatus
impl PartialEq<TrialComponentPrimaryStatus> for TrialComponentPrimaryStatus
source§fn eq(&self, other: &TrialComponentPrimaryStatus) -> bool
fn eq(&self, other: &TrialComponentPrimaryStatus) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<TrialComponentPrimaryStatus> for TrialComponentPrimaryStatus
impl PartialOrd<TrialComponentPrimaryStatus> for TrialComponentPrimaryStatus
source§fn partial_cmp(&self, other: &TrialComponentPrimaryStatus) -> Option<Ordering>
fn partial_cmp(&self, other: &TrialComponentPrimaryStatus) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for TrialComponentPrimaryStatus
impl StructuralEq for TrialComponentPrimaryStatus
impl StructuralPartialEq for TrialComponentPrimaryStatus
Auto Trait Implementations§
impl RefUnwindSafe for TrialComponentPrimaryStatus
impl Send for TrialComponentPrimaryStatus
impl Sync for TrialComponentPrimaryStatus
impl Unpin for TrialComponentPrimaryStatus
impl UnwindSafe for TrialComponentPrimaryStatus
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.